## Abstract

Linear rules have played an increasing role in structural proof theory in recent years. It has been observed that the set of all sound linear inference rules in Boolean logic is already coNP-complete, i.e. that every Boolean tautology can be written as a (left- and right-)linear rewrite rule. In this paper we study properties of systems consisting only of linear inferences. Our main result is that the length of any 'nontrivial' derivation in such a system is bound by a polynomial. As a consequence there is no polynomial-time decidable sound and complete system of linear inferences, unless coNP = NP. We draw tools and concepts from term rewriting, Boolean function theory and graph theory in order to access some required intermediate results. At the same time we make several connections between these areas that, to our knowledge, have not yet been presented and constitute a rich theoretical framework for reasoning about linear TRSs for Boolean logic.

Original language | English |
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Article number | 9 |

Pages (from-to) | 1-27 |

Number of pages | 27 |

Journal | Logical Methods in Computer Science |

Volume | 12 |

Issue number | 4 |

Early online date | 28 Dec 2016 |

DOIs | |

Publication status | Published - 27 Apr 2017 |

### Bibliographical note

Special Issue: Selected papers of the joint 26th International Conference on "Rewriting Techniques and Applications" and 13th International Conference on "Typed Lambda Calculi and Applications" RTA/TLCA 2015## Keywords

- Boolean logic
- Linear rewriting
- Proof theory

## ASJC Scopus subject areas

- Theoretical Computer Science
- Computer Science(all)